everest in nepal, cameras in iceland, greenland, canada, and alaska, and some other sites in france and switzerland and bolivia, where we work as well. we're up to nearly a million pictures right now and we have a gigantic archive of how the world has been changing as a consequence of climate change melting the glaciers. >> did you set out with this project knowing or expecting that you were going to see a pretty progressive retreating of glacial activity? >> what we have seen has been a complete shock. i really never expected to see this magnitude of change, this pace of change. it really is astounding. and every time we open the backs of the cameras, it's like, whoa, are you kidding me? this is what just happened? it's really quite extraordinary. >> this is the camera, and that's an interesting sight. this is the memory of the landscape. that landscape is gone. it may never be seen again in the history of civilization, and it's stored here. >> if the advancing and retreating happens all of the time, what makes what you witness here so different or so shocking? >> the advance in retrea